connect system/manager
GRANT DBA TO YONG;

CONNECT yong/gari
CREATE ROLE Query_Data;
CREATE ROLE Update_Data;
CREATE ROLE Delete_Data;

GRANT CONNECT                  TO Query_Data;

GRANT SELECT, INSERT ON Account  TO Query_Data;

GRANT UPDATE ON Account  TO Update_Data;

GRANT DELETE ON Account  TO Delete_Data;

CREATE USER SeryPark IDENTIFIED By SeriPark;

GRANT Query_Data TO SeryPark;